1 /* Fully extensible Emacs, running on Unix, intended for GNU.
2 Copyright (C) 1985, 1986, 1987, 1993 Free Software Foundation, Inc.
4 This file is part of GNU Emacs.
6 GNU Emacs is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
11 GNU Emacs is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with GNU Emacs; see the file COPYING. If not, write to
18 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
27 #include <sys/types.h>
35 #include <sys/ioctl.h>
40 #include <default_acl.h>
46 #include "intervals.h"
49 #include "syssignal.h"
56 /* Command line args from shell, as list of strings */
57 Lisp_Object Vcommand_line_args
;
59 /* The name under which Emacs was invoked, with any leading directory
61 Lisp_Object Vinvocation_name
;
63 /* The directory name from which Emacs was invoked. */
64 Lisp_Object Vinvocation_directory
;
66 /* Hook run by `kill-emacs' before it does really anything. */
67 Lisp_Object Vkill_emacs_hook
;
69 /* Set nonzero after Emacs has started up the first time.
70 Prevents reinitialization of the Lisp world and keymaps
71 on subsequent starts. */
74 /* Variable whose value is symbol giving operating system type. */
75 Lisp_Object Vsystem_type
;
77 /* Variable whose value is string giving configuration built for. */
78 Lisp_Object Vsystem_configuration
;
80 /* If non-zero, emacs should not attempt to use an window-specific code,
81 but instead should use the virtual terminal under which it was started */
82 int inhibit_window_system
;
84 /* If nonzero, set Emacs to run at this priority. This is also used
85 in child_setup and sys_suspend to make sure subshells run at normal
86 priority; Those functions have their own extern declaration. */
91 extern int inherited_pgroup
;
95 /* If non-zero, -d was specified, meaning we're using some window system. */
99 /* An address near the bottom of the stack.
100 Tells GC how to save a copy of the stack. */
103 #ifdef HAVE_X_WINDOWS
104 extern Lisp_Object Vwindow_system
;
105 #endif /* HAVE_X_WINDOWS */
107 #ifdef USG_SHARED_LIBRARIES
108 /* If nonzero, this is the place to put the end of the writable segment
111 unsigned int bss_end
= 0;
114 /* Nonzero means running Emacs without interactive terminal. */
118 /* Value of Lisp variable `noninteractive'.
119 Normally same as C variable `noninteractive'
120 but nothing terrible happens if user sets this one. */
124 /* Signal code for the fatal signal that was received */
125 int fatal_error_code
;
127 /* Nonzero if handling a fatal error already */
128 int fatal_error_in_progress
;
130 /* Handle bus errors, illegal instruction, etc. */
132 fatal_error_signal (sig
)
135 fatal_error_code
= sig
;
136 signal (sig
, SIG_DFL
);
138 /* If fatal error occurs in code below, avoid infinite recursion. */
139 if (! fatal_error_in_progress
)
141 fatal_error_in_progress
= 1;
143 shut_down_emacs (sig
, 0, Qnil
);
147 LIB$
STOP (SS$_ABORT
);
149 /* Signal the same code; this time it will really be fatal.
150 Remember that since we're in a signal handler, the signal we're
151 going to send is probably blocked, so we have to unblock it if we
152 want to really receive it. */
154 sigunblock (sigmask (fatal_error_code
));
156 kill (getpid (), fatal_error_code
);
162 /* Handle bus errors, illegal instruction, etc. */
164 memory_warning_signal (sig
)
167 signal (sig
, memory_warning_signal
);
169 malloc_warning ("Operating system warns that virtual memory is running low.\n");
173 /* Code for dealing with Lisp access to the Unix command line */
176 init_cmdargs (argc
, argv
, skip_args
)
183 Vinvocation_name
= Ffile_name_nondirectory (build_string (argv
[0]));
184 Vinvocation_directory
= Ffile_name_directory (build_string (argv
[0]));
185 /* If we got no directory in argv[0], search PATH to find where
186 Emacs actually came from. */
187 if (NILP (Vinvocation_directory
))
190 int yes
= openp (Vexec_path
, Vinvocation_name
,
191 EXEC_SUFFIXES
, &found
, 1);
193 Vinvocation_directory
= Ffile_name_directory (found
);
196 Vcommand_line_args
= Qnil
;
198 for (i
= argc
- 1; i
>= 0; i
--)
200 if (i
== 0 || i
> skip_args
)
202 = Fcons (build_string (argv
[i
]), Vcommand_line_args
);
206 DEFUN ("invocation-name", Finvocation_name
, Sinvocation_name
, 0, 0, 0,
207 "Return the program name that was used to run Emacs.\n\
208 Any directory names are omitted.")
211 return Fcopy_sequence (Vinvocation_name
);
214 DEFUN ("invocation-directory", Finvocation_directory
, Sinvocation_directory
,
216 "Return the directory name in which the Emacs executable was located")
219 return Fcopy_sequence (Vinvocation_directory
);
224 #ifdef LINK_CRTL_SHARE
225 #ifdef SHAREABLE_LIB_BUG
226 extern noshare
char **environ
;
227 #endif /* SHAREABLE_LIB_BUG */
228 #endif /* LINK_CRTL_SHARE */
231 #ifndef ORDINARY_LINK
232 /* We don't include crtbegin.o and crtend.o in the link,
233 so these functions and variables might be missed.
234 Provide dummy definitions to avoid error.
235 (We don't have any real constructors or destructors.) */
239 __do_global_ctors_aux ()
243 /* Linux has a bug in its library; avoid an error. */
245 char * __CTOR_LIST__
[2] = { (char *) (-1), 0 };
247 char * __DTOR_LIST__
[2] = { (char *) (-1), 0 };
250 #endif /* __GNUC__ */
251 #endif /* ORDINARY_LINK */
254 main (argc
, argv
, envp
)
259 char stack_bottom_variable
;
263 extern char *sys_errlist
[];
264 extern void malloc_warning ();
266 /* Map in shared memory, if we are using that. */
268 if (argc
> 1 && !strcmp (argv
[1], "-nl"))
271 /* The shared memory was just restored, which clobbered this. */
277 /* The shared memory was just restored, which clobbered this. */
283 extern int malloc_cookie
;
285 /* This helps out unexnext.c. */
287 if (malloc_jumpstart (malloc_cookie
) != 0)
288 printf ("malloc jumpstart failed!\n");
291 #ifdef HAVE_X_WINDOWS
292 /* Stupid kludge to catch command-line display spec. We can't
293 handle this argument entirely in window system dependent code
294 because we don't even know which window system dependent code
295 to run until we've recognized this argument. */
299 for (i
= 1; (i
< argc
&& ! display_arg
); i
++)
300 if (!strcmp (argv
[i
], "-d") || !strcmp (argv
[i
], "-display"))
306 /* If -map specified, map the data file in */
307 if (argc
> 2 && ! strcmp (argv
[1], "-map"))
310 mapin_data (argv
[2]);
313 #ifdef LINK_CRTL_SHARE
314 #ifdef SHAREABLE_LIB_BUG
315 /* Bletcherous shared libraries! */
317 stdin
= fdopen (0, "r");
319 stdout
= fdopen (1, "w");
321 stderr
= fdopen (2, "w");
324 #endif /* SHAREABLE_LIB_BUG */
325 #endif /* LINK_CRTL_SHARE */
328 /* Record (approximately) where the stack begins. */
329 stack_bottom
= &stack_bottom_variable
;
331 #ifdef RUN_TIME_REMAP
333 run_time_remap (argv
[0]);
336 #ifdef USG_SHARED_LIBRARIES
345 inherited_pgroup
= EMACS_GETPGRP (0);
346 setpgrp (0, getpid ());
353 /* If USE_DOMAIN_ACLS environment variable exists,
354 use ACLs rather than UNIX modes. */
355 if (egetenv ("USE_DOMAIN_ACLS"))
356 default_acl (USE_DEFACL
);
360 #ifndef SYSTEM_MALLOC
363 /* Arrange to get warning messages as memory fills up. */
364 memory_warnings (0, malloc_warning
);
366 /* Arrange to disable interrupt input while malloc and friends are
368 uninterrupt_malloc ();
370 #endif /* not SYSTEM_MALLOC */
373 /* We do all file input/output as binary files. When we need to translate
374 newlines, we do that manually. */
376 (stdin
)->_flag
&= ~_IOTEXT
;
377 (stdout
)->_flag
&= ~_IOTEXT
;
378 (stderr
)->_flag
&= ~_IOTEXT
;
383 nice (emacs_priority
);
385 #endif /* PRIO_PROCESS */
387 inhibit_window_system
= 0;
389 /* Handle the -t switch, which specifies filename to use as terminal */
390 if (skip_args
+ 2 < argc
&& !strcmp (argv
[skip_args
+ 1], "-t"))
396 result
= open (argv
[skip_args
], O_RDWR
, 2 );
401 if (errno
>= 0 && errno
< sys_nerr
)
402 errstring
= sys_errlist
[errno
];
404 errstring
= "undocumented error code";
405 fprintf (stderr
, "emacs: %s: %s\n", argv
[skip_args
], errstring
);
411 fprintf (stderr
, "emacs: %s: not a tty\n", argv
[skip_args
]);
414 fprintf (stderr
, "Using %s\n", argv
[skip_args
]);
415 #ifdef HAVE_X_WINDOWS
416 inhibit_window_system
= 1; /* -t => -nw */
420 if (skip_args
+ 1 < argc
421 && (!strcmp (argv
[skip_args
+ 1], "-nw")))
424 inhibit_window_system
= 1;
427 /* Handle the -batch switch, which means don't do interactive display. */
429 if (skip_args
+ 1 < argc
&& !strcmp (argv
[skip_args
+ 1], "-batch"))
441 ! noninteractive
|| initialized
447 /* Don't catch these signals in batch mode if not initialized.
448 On some machines, this sets static data that would make
449 signal fail to work right when the dumped Emacs is run. */
450 signal (SIGHUP
, fatal_error_signal
);
451 signal (SIGQUIT
, fatal_error_signal
);
452 signal (SIGILL
, fatal_error_signal
);
453 signal (SIGTRAP
, fatal_error_signal
);
455 /* This is missing on some systems - OS/2, for example. */
456 signal (SIGIOT
, fatal_error_signal
);
459 signal (SIGEMT
, fatal_error_signal
);
461 signal (SIGFPE
, fatal_error_signal
);
463 signal (SIGBUS
, fatal_error_signal
);
465 signal (SIGSEGV
, fatal_error_signal
);
467 signal (SIGSYS
, fatal_error_signal
);
469 signal (SIGTERM
, fatal_error_signal
);
471 signal (SIGXCPU
, fatal_error_signal
);
474 signal (SIGXFSZ
, fatal_error_signal
);
478 /* This just means available memory is getting low. */
479 signal (SIGDANGER
, memory_warning_signal
);
483 signal (20, fatal_error_signal
);
484 signal (21, fatal_error_signal
);
485 signal (22, fatal_error_signal
);
486 signal (24, fatal_error_signal
);
487 #if 0 /* mvn@library.ucla.edu says these are SIGIO on AIX 3.2.4. */
488 signal (23, fatal_error_signal
);
490 signal (SIGAIO
, fatal_error_signal
);
491 signal (SIGPTY
, fatal_error_signal
);
495 signal (SIGIOINT
, fatal_error_signal
);
497 signal (SIGGRANT
, fatal_error_signal
);
498 signal (SIGRETRACT
, fatal_error_signal
);
499 signal (SIGSOUND
, fatal_error_signal
);
500 signal (SIGMSG
, fatal_error_signal
);
504 noninteractive1
= noninteractive
;
506 /* Perform basic initializations (not merely interning symbols) */
513 init_syntax_once (); /* Create standard syntax table. */
514 /* Must be done before init_buffer */
515 init_casetab_once ();
516 init_buffer_once (); /* Create buffer table and some buffers */
517 init_minibuf_once (); /* Create list of minibuffers */
518 /* Must precede init_window_once */
519 init_window_once (); /* Init the window system */
527 /* Call early 'cause init_environment needs it. */
529 /* Set defaults for several environment variables. */
530 if (initialized
) init_environment (argc
, argv
, skip_args
);
533 /* egetenv is a pretty low-level facility, which may get called in
534 many circumstances; it seems flimsy to put off initializing it
535 until calling init_callproc. */
536 set_process_environment ();
537 /* AIX crashes are reported in system versions 3.2.3 and 3.2.4
538 if this is not done. Do it after set_process_environment so that we
539 don't pollute Vprocess_environment. */
544 init_buffer (); /* Init default directory of main buffer */
546 init_callproc_1 (); /* Must precede init_cmdargs and init_sys_modes. */
547 init_cmdargs (argc
, argv
, skip_args
); /* Must precede init_lread. */
548 init_callproc (); /* Must follow init_cmdargs but not init_sys_modes. */
554 init_vms_input ();/* init_display calls get_frame_size, that needs this */
556 init_display (); /* Determine terminal type. init_sys_modes uses results */
558 init_keyboard (); /* This too must precede init_sys_modes */
560 init_vmsproc (); /* And this too. */
562 init_sys_modes (); /* Init system terminal modes (RAW or CBREAK, etc.) */
566 #ifdef LISP_FLOAT_TYPE
573 #ifdef CLASH_DETECTION
575 #endif /* CLASH_DETECTION */
577 /* Intern the names of all standard functions and variables; define standard keys */
581 /* The basic levels of Lisp must come first */
582 /* And data must come first of all
583 for the sake of symbols like error-message */
596 syms_of_casefiddle ();
600 #ifndef NO_DIR_LIBRARY
602 #endif /* not NO_DIR_LIBRARY */
608 #ifdef CLASH_DETECTION
610 #endif /* CLASH_DETECTION */
624 /* Only defined if Emacs is compiled with USE_TEXT_PROPERTIES */
631 #ifdef HAVE_X_WINDOWS
640 #endif /* HAVE_X_MENU */
641 #endif /* HAVE_X_WINDOWS */
651 keys_of_casefiddle ();
664 /* Handle -l loadup-and-dump, args passed by Makefile. */
665 if (argc
> 2 + skip_args
&& !strcmp (argv
[1 + skip_args
], "-l"))
666 Vtop_level
= Fcons (intern ("load"),
667 Fcons (build_string (argv
[2 + skip_args
]), Qnil
));
669 /* Unless next switch is -nl, load "loadup.el" first thing. */
670 if (!(argc
> 1 + skip_args
&& !strcmp (argv
[1 + skip_args
], "-nl")))
671 Vtop_level
= Fcons (intern ("load"),
672 Fcons (build_string ("loadup.el"), Qnil
));
673 #endif /* CANNOT_DUMP */
678 #if defined (sun) || defined (LOCALTIME_CACHE)
679 /* sun's localtime has a bug. it caches the value of the time
680 zone rather than looking it up every time. Since localtime() is
681 called to bolt the undumping time into the undumped emacs, this
682 results in localtime ignoring the TZ environment variable.
683 This flushes the new TZ value into localtime. */
685 #endif /* defined (sun) || defined (LOCALTIME_CACHE) */
687 /* Enter editor command loop. This never returns. */
692 DEFUN ("kill-emacs", Fkill_emacs
, Skill_emacs
, 0, 1, "P",
693 "Exit the Emacs job and kill it.\n\
694 If ARG is an integer, return ARG as the exit program code.\n\
695 If ARG is a string, stuff it as keyboard input.\n\n\
696 The value of `kill-emacs-hook', if not void,\n\
697 is a list of functions (of no args),\n\
698 all of which are called before Emacs is actually killed.")
702 Lisp_Object hook
, hook1
;
711 if (!NILP (Vrun_hooks
) && !noninteractive
)
712 call1 (Vrun_hooks
, intern ("kill-emacs-hook"));
716 /* Is it really necessary to do this deassign
717 when we are going to exit anyway? */
722 shut_down_emacs (0, 0, STRINGP (arg
) ? arg
: Qnil
);
724 exit ((XTYPE (arg
) == Lisp_Int
) ? XINT (arg
)
735 /* Perform an orderly shutdown of Emacs. Autosave any modified
736 buffers, kill any child processes, clean up the terminal modes (if
737 we're in the foreground), and other stuff like that. Don't perform
738 any redisplay; this may be called when Emacs is shutting down in
739 the background, or after its X connection has died.
741 If SIG is a signal number, print a message for it.
743 This is called by fatal signal handlers, X protocol error handlers,
747 shut_down_emacs (sig
, no_x
, stuff
)
751 /* If we are controlling the terminal, reset terminal modes */
752 #ifdef EMACS_HAVE_TTY_PGRP
754 int pgrp
= EMACS_GETPGRP (0);
757 if (EMACS_GET_TTY_PGRP (0, &tpgrp
) != -1
762 if (sig
&& sig
!= SIGTERM
)
763 fprintf (stderr
, "Fatal error (%d).", sig
);
771 stuff_buffered_input (stuff
);
773 kill_buffer_processes (Qnil
);
774 Fdo_auto_save (Qt
, Qnil
);
776 #ifdef CLASH_DETECTION
781 kill_vms_processes ();
784 #ifdef HAVE_X_WINDOWS
785 if (!noninteractive
&& EQ (Vwindow_system
, intern ("x")) && ! no_x
)
786 Fx_close_current_connection ();
787 #endif /* HAVE_X_WINDOWS */
790 /* There is a tendency for a SIGIO signal to arrive within exit,
791 and cause a SIGHUP because the input descriptor is already closed. */
793 signal (SIGIO
, SIG_IGN
);
800 /* Nothing like this can be implemented on an Apollo.
805 DEFUN ("dump-emacs-data", Fdump_emacs_data
, Sdump_emacs_data
, 1, 1, 0,
806 "Dump current state of Emacs into data file FILENAME.\n\
807 This function exists on systems that use HAVE_SHM.")
809 Lisp_Object intoname
;
813 extern void malloc_warning ();
815 CHECK_STRING (intoname
, 0);
816 intoname
= Fexpand_file_name (intoname
, Qnil
);
822 /* Tell malloc where start of impure now is */
823 /* Also arrange for warnings when nearly out of space. */
824 #ifndef SYSTEM_MALLOC
825 memory_warnings (&my_edata
, malloc_warning
);
827 map_out_data (XSTRING (intoname
)->data
);
834 #else /* not HAVE_SHM */
836 DEFUN ("dump-emacs", Fdump_emacs
, Sdump_emacs
, 2, 2, 0,
837 "Dump current state of Emacs into executable file FILENAME.\n\
838 Take symbols from SYMFILE (presumably the file you executed to run Emacs).\n\
839 This is used in the file `loadup.el' when building Emacs.\n\
841 Bind `command-line-processed' to nil before dumping,\n\
842 if you want the dumped Emacs to process its command line\n\
843 and announce itself normally when it is run.")
845 Lisp_Object intoname
, symname
;
849 extern void malloc_warning ();
851 CHECK_STRING (intoname
, 0);
852 intoname
= Fexpand_file_name (intoname
, Qnil
);
855 CHECK_STRING (symname
, 0);
856 if (XSTRING (symname
)->size
)
857 symname
= Fexpand_file_name (symname
, Qnil
);
865 mapout_data (XSTRING (intoname
)->data
);
867 /* Tell malloc where start of impure now is */
868 /* Also arrange for warnings when nearly out of space. */
869 #ifndef SYSTEM_MALLOC
870 memory_warnings (&my_edata
, malloc_warning
);
872 unexec (XSTRING (intoname
)->data
,
873 !NILP (symname
) ? XSTRING (symname
)->data
: 0, &my_edata
, 0, 0);
881 #endif /* not HAVE_SHM */
883 #endif /* not CANNOT_DUMP */
890 decode_env_path (evarname
, defalt
)
891 char *evarname
, *defalt
;
893 register char *path
, *p
;
894 extern char *index ();
898 /* It's okay to use getenv here, because this function is only used
899 to initialize variables when Emacs starts up, and isn't called
902 path
= (char *) getenv (evarname
);
910 p
= index (path
, SEPCHAR
);
911 if (!p
) p
= path
+ strlen (path
);
912 lpath
= Fcons (p
- path
? make_string (path
, p
- path
) : Qnil
,
919 return Fnreverse (lpath
);
926 defsubr (&Sdump_emacs_data
);
928 defsubr (&Sdump_emacs
);
932 defsubr (&Skill_emacs
);
934 defsubr (&Sinvocation_name
);
935 defsubr (&Sinvocation_directory
);
937 DEFVAR_LISP ("command-line-args", &Vcommand_line_args
,
938 "Args passed by shell to Emacs, as a list of strings.");
940 DEFVAR_LISP ("system-type", &Vsystem_type
,
941 "Value is symbol indicating type of operating system you are using.");
942 Vsystem_type
= intern (SYSTEM_TYPE
);
944 DEFVAR_LISP ("system-configuration", &Vsystem_configuration
,
945 "Value is string indicating configuration Emacs was built for.");
946 Vsystem_configuration
= build_string (CONFIGURATION
);
948 DEFVAR_BOOL ("noninteractive", &noninteractive1
,
949 "Non-nil means Emacs is running without interactive terminal.");
951 DEFVAR_LISP ("kill-emacs-hook", &Vkill_emacs_hook
,
952 "Hook to be run whenever kill-emacs is called.\n\
953 Since kill-emacs may be invoked when the terminal is disconnected (or\n\
954 in other similar situations), functions placed on this hook should not\n\
955 expect to be able to interact with the user.");
956 Vkill_emacs_hook
= Qnil
;
958 DEFVAR_INT ("emacs-priority", &emacs_priority
,
959 "Priority for Emacs to run at.\n\
960 This value is effective only if set before Emacs is dumped,\n\
961 and only if the Emacs executable is installed with setuid to permit\n\
962 it to change priority. (Emacs sets its uid back to the real uid.)");
965 staticpro (&Vinvocation_name
);
966 Vinvocation_name
= Qnil
;
967 staticpro (&Vinvocation_directory
);
968 Vinvocation_directory
= Qnil
;